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Kernel Tracing Using Ftrace

Ftrace is one of those useful “kernel debugging” tools which you turn to when other debugging tools fail to reveal the underlying problem. Ftrace is a Linux kernel internals tracing tool that was first included in the 2.6.27 kernel in 2008. The main developer was (and still is) Steven Rostedt who is currently a Red Hat employee with responsiblity for the real-time patches in the Linux kernel. The name ftrace comes from the term function tracer, which was the original purpose of the tool, but nowadays it can do a lot more than just trace function calls. Over the years,